/Engine/Source/Runtime/LiveLinkInterface/Public/ILiveLinkClient.h
The prefer method is EvaluateFrame_AnyThread this method should be used for diagnostic or replication.
bool EvaluateFrameFromSource_AnyThread ( const [FLiveLinkSubjectKey](API\Runtime\LiveLinkInterface\FLiveLinkSubjectKey) & SubjectKey, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [ULiveLinkRole](API\Runtime\LiveLinkInterface\ULiveLinkRole) > Role, [FLiveLinkSubjectFrameData](API\Runtime\LiveLinkInterface\FLiveLinkSubjectFrameData) & OutFrame )